... to the 4f sublevel in the lanthanoid series. Electrons are added to the 5f sublevel in the actinoid series ... Lanthanoids and actinoids are separate classes ...
Group the 63 known elements by their physical properties ... Actinoid series. Atomic #: 89 to 102. All radioactive. Only Th (90) and U (92) occur naturally ...
Chemistry Chapter 9 Christopher Chui Early Attempts at Classification Dobereiner (1817) discovered groups of three elements with similar properties triad Triads ...
... 1s22s22p63s1 How many electrons does Fe have? 26 What is the electron configuration ... Argon What period is Selenium in? 4th Kernel structure for selenium ...
Barium/137.3. Average. 88.7. Strontium/87.6. Triad 3. Triad 2. Triad 1 ... in 1872, organized the elements in eight columns in order of increasing atomic mass ...
Periodic Table Notes Put these on the back of your table Columns (vertical) # 1-18 (groups or families) Have similar but not identical properties Rows (horizontal) #1 ...
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University 'POLITEHNICA' of Timisoara. Faculty of Industrial Chemistry and ... The next element, beryllium (Z = 4), has 4 electrons which occupy the 1s and 2s ...
The Bohr Atom Thompson: plum pudding Rutherford: nucleus in a sea of electrons. Bohr: planetary model. Wave velocity = (wavelength)(frequency). Review of wave mechanics.
Scandium (+2, +3) vs Titanium (+2, +3, +4) Vs Copper (+1, +2) Ionization Energy Ionization energy: the energy required to remove one electron from a gaseous atom.
By looking at where a element is on the periodic table, you can tell ... Halogens. 7 valence electrons. Need only one electron to fill outermost electron shell ...